On the Sketch toolbar, click the Spline flyout, and then select Equation Driven Curve or click Tools > Sketch Entities > Equation Driven Curve.

Under Equation Type, select Explicit or Parametric.

3D sketches support parametric equations only.

Under Equation, specify the curve equation where:

Y is a function of X (explicit equations).

x^3/"D1@Sketch5"

You can use any functions supported in the Equations dialog box. For example:

2*(x + 3*sin(x))

X, Y, and Z are functions of T (parametric equations). For example:

Let x be defined by: sin(t)

Let y be defined by: cos(t)

For t1 = 0 and t2 = pi, the result is a semi-circle. (Closed geometry is not allowed.)

Z is for 3D sketches only.

Under Parameters, specify the range of values for X (explicit equations) or T (parametric equations), where _{1} is the start point and _{2} is the end point (for example, X_{1} = 0 and X_{2} = 2*pi).

Click to lock or unlock the start or end point location on the curve:

(locked): The start or end point is fixed.

(unlocked): You can drag the start or end point along the curve.

Click .

The curve defined by the equation appears in the sketch.

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